Process of coating cast-iron with other metals or alloys



PATENT; OFFICE.

'LUOIAN R. NOURSE,

PROCESS OF COATlNG CAST-IRON OF ELGIN, ILLINOIS.

WITH OTHER METALS R ALLOYS.

SPECIFICATION forming part of Letters Patent No. 516,551, dated March 13, 1894. Application filed iinly'lZ, 1893. Serial No.'4 80,289. on specimens.)

To on whom it may concern:

Be it known that I, LUCIAN RJNouas'n, a citizen of the United States, residing at South Elgin, in the county of Kane and State of Illinow, have invented certain new and useful Improvements inProcesses of Coating Cast:

Iron with other Metals or Alloys; and I do hereby declare the following to be afull, clear, and exact descriptionof the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

. My present invention relatestoithe art. of

coating or plating metal with other metals or alloys, and has for its primary object tO-PI'OE vide a supplemental, integral. metallic coating for cast iron' surfaces to which other metals will tenaciously adhere; the fusing or r I melting point of which coating is 'abovethat of the metal or alloy with which it is intended to be finally coated. Then after havingbeen dipped in a-suitable flux, the supplemental metal coated articles are immersed inthe molten metal desired for the final coating.

sized bath, and in a reasonably short time. Thls has never to my knowledge been done All the varioussolu prior to my invention. tions used being of such a composition that only weak currents of electricity could be utilized, besides causing the deposits to form only upon the more prominent parts of the article to be coated, and upon particularly ob jection'ably formed or shaped articles having depressions and angles in the same without any, or so little of the coating that no melted metal would adhere, causing the whole arti-' ole or articles to be worthless; and that if a reasonably strong current were used, pxidation of the metal depositedtook place, spoiling the work itselfand so changing the solution that even with a weak amount it afterward failed to produce the proper effect. I have found in the practical demonstration of my invention that a current of electricity larger in proportion to the quantity of ingredients added from time to time can be used by my improved process and solution and therebyevercome all the .heretoforeobjectionable features stated. Furthermore,

comparatively heavy coating must be deposited to obtain good results,and this can only be obtained by a strong current and a constantly uniform solution. As a perfect productof such articles will only command low malleableand wrought iron, tinned and galvanized articles), all effortsheretofore to produce commercially desirable cast iron coated [articles have so faras-my knowledge extends .failed; whereas the cost of my process is so theproduct of the process, thereby adding greatly to the industry of producing cast iron articles with properly coated surfaces. I The invention will be fully disclosed in the following specification'and claim.

,I first prepare an electroplating bath consisti'ng of a saturated solution of a salt or double salt of iron, sulphate of iron being preferred, and somepbor'ate or boric compound, preferably boracic acid and water,-then by a suitable heating'apparatus, such as steam conducting pipes, the temperature of the bath is raised until the abnormal heat of from 130 maintained while the work is going on; at which temperature the bath will show by a hydrometer a density .of 17 to 20 Baum; sufficient of the sulphate of iron-and boracic acid being constantly supplied to the bath to cause the solution to remain saturated with them. For a bath which is maintained at the temperature specified, I use about :tWo and one half pounds of sulphate ofiron and about six ounces of boracic acid to each gallonof being now placed in position and properly connected electrically to a low tension but strong current of electricity, maintained at as constant a supply as it is possible, the articles will be found to receive a white. or nearly smooth castings requiring less and rough castlngs more than an average amount of time in the solution to produce an effective coating.

owing 'to the porous nature of cast iron a the solution. The iron articles to be coatedwhite coating, the thickness of which dependsupon the time they rem'ain in the bath. Veryprices, (they being in direct competition with low that a great demand is being created for to Fahrenheit is reached and constantly ICO 

